/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraGraph.h
Rename parameter from map and all the pins associated.
true if the new name was applied.
bool RenameParameter ( const [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) & Parameter, [FName](API\Runtime\Core\UObject\FName) NewName, bool bRenameRequestedFromStaticSwitch, bool * bMerged, bool bSuppressEvents )